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Examine the routing table (of course, if it's available) of the NAS. Most likely the NAS sends all the outgoing packets over eth1 port. The thing is eth1 and eth2 at the NAS both belong to 10.0.10.0/24 network. For an outgoing packet the routing mechanism seeks for the best rule which can be applied for the packet, and that rule points to only one interface which will be used for sending. It seems in your case it's eth1. If Server1 and Server2 reside in different networks then you had best to choose different subnets for each of them, say, 10.0.10.0/24 and 10.0.11.0/24.